Multicylinder engine.



B. G. GUNN.

MULTIGYLINDER ENGINE.

APPLICATION FILED DEC. 9, 1914.

1,132,256. Patented Mar. 16, 1915,

2 SHEETS-SHEET 1.

A TTORNEKS.

E. G. GUNN.

MULTICYLINDER ENGINE.

APPLICATION FILED DEC. 9, 1914.

WI T/VE 88E 8:

Patented Mar. 16, 1915.

2 SHEETS-SHEET 2.

. A TTOR/VE V1 i run STATES PATEN Fri EARL G. GUNN', OF DETROIT, MICHIGAN, ASSIGNOR T0 GENERAL MOTORS COMPANY, OF

v.I)Iii'.i."BOI'.l., MICHIGAN, A CORPORATION OF NEW JERSEY.

MULTICYLINDER ENGINE.

To all ichom it may concern:

Be it known that I, EARL G. G NN, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Multicylinder Engines, of which the following 1s a specification, reference being had therein to the accompanying drawings.

- The invention relates to engines of the multi-cylinder V-type, and it is the object of the invention to obtain a construction which is more easily manufactured and assembled and which also possesses various advantages over constructions heretofore used. In the present state of the art, the \/-type of motor isparticularly advantageous in motor vehicle, construction where a large number of cylinders are used,as for instance, in

without increasing the complication ofthe casting problem.

It is a further object to reduce the weight of the motor, and particularly to lessen the weight of the parts which must be handled during the machining operations. This I have accomplished by forming the cylinders and crank case in two sections meeting in a central vertical plane, each section having all of the cylinders and the crank case portion thereof cast an -bloc. To further reduce the weight, I preferably form these castings of aluminum, providing bushings of a harder metal for the cylinders, and to avoid difficulty in the construction of the valves the latter are arranged in a detachable head,

which is preferably formed of, a harder material, such as cast iron. lhus the valve seats and all of the complex parts (which are difficult to form in aluminum castings) are formed in cast iron heads, While the cylinders, water jackets and crank case are formed of aluminum. Furthermore, the division of Patented Mar. 16, 1915.

Application filed December 9, 1914. Serial No. 876,230.

the crank case in a vertical plane not only places all of the cylinders of each casing in the same plane but also has various other advantages, such as formin a simple construction for carrying, Facilitating. the mounting of the crank and cam shafts and also permitting of assembling all of the pistons, pitmen, etc, in connection with one section of the cylinders before engaging the other set of cylinders therewith.

Other more specific features of construction and the advantages thereof will be hereinafter set forth.

In the drawings: Figure l is a sectional end elevation of my improved motor; and Fig. 2 is an elevation of one of the cylinder sections showing the crank and cam shafts in position.

A and B are two complementary sections forming the V-motor, each section having a plurality of cylinders and one-half of the crank case cast on block. The meeting plane of these sections is the vertical central plane of the engine, and the crank case is so designed as to form abutting clamping flanges- 0 extending upward into the space of the V,

' and also abutting end flanges D. At the bottom the crank .case is formed with an opening which registers with a pressed sheet metal oil-pan it, said pan having flat securing flanges F all in the same plane and abutting against complementary fianges on the bottom of the crank case. This construction simplifies the manufacture of the oil-pan and by extending the crank case sections above and below the cam shaft and crank shaft bearings a strong-and rigid construction is obtained.

\Vhere the sections A and B are formed of aluminum castings, each of the cylinders is provided with a bushing G formed of a harder metal and preferably provided with a flange G at its upper end engaging a seat in the casting. The heads H when secured to the castings A and B clamp all of the bushings in position and also form the valve seats, and inlet and exhaust ports for the respective cylinders. As shown, the valves I have outwardly-extending stems I which are operated by levers J connected to valve rods K extending parallel to the cylinders and within the V-space between the opposite sections. .1 preferably inclose all of the valve rods by extending them through recesses L in the sections A and B, said rev 1 cylinders. In assembling the engine the pistons, pitmen and crank shaft may first be secured to each other and then mounted upon one of the sections, the shafts being secured. in their bearings O and P. The complementary section is then placed in position, the pistons being engaged with the several cylinders, after which the flanges C and D are clamped to each other by bolts Q and R or other suitable means. Thus the Work of assembling the parts is much simpler with this construction than where the opposite cylinders of the V are integral with each other and the crank case.

It will be observed that the shape of the crank case is such that portions thereof ex-v tend laterally from the engine cylinders in an upwardly-inclined plane to the meeting flanges C. This enlarges the vertical dimension of the case so as to increase its strength and rigidity and also makes provision for the cam shaft where it will clear the crank and pitmen. 1 'What I claim as my invention is 1. A multi-cylinder engine formed of .complementary sections, each section comprising a plurality of cylinders and a part of the'crank case integrally cast, the crank case sections meeting in the central vertical plane and being arranged at an angle to the axesof the cylinders to form a V-type motor.

2. A multi-cylinder" engine formed of complementary sections, each section comprising a plurality of cylinders with parallel axes and a part of the crank case integral therewith, the crank case sections meetingin the central vertical plane of the engine, extending above and below the crank shaft and being at an angle to the axes of v the cylinders to-form a.V-type motor.

3. A multi-cylinder engine comprising complementary sections each having a plurality of parallel cylinders and a part of the crank case integral therewith, said crank case sectionsmeeting in the central vertical plane of the engine, extending above and below the crank shaft, having abutting bearings at the top and the ends and an open well at the bottom, the angle of the meeting faces to the planes of the cylinders being such as to form a V-type motor, clamping means for said sections above and below the crank shaft, and a sheet metal pan de- 1,1a2,2ae

pending from the crank case in registration with the well in the bottom thereof.

1. A multi-cylinder engine comprising complementary sections, each consisting of a plurality of cylinders and a part of the crank case integral therewith and formed of a relatively light material such as aluminum, said sections abutting in the central vertical plane of the engine and being at an angle to each other to form a V-type motor,

mentary engine casing sections abutting in.

the plane of said crank and cam shafts, each section consisting of a crank case portion and a plurality of cylinders cast en bloc, the crank case portions extending above and below the crank and cam shafts, with abutting faces at the top and ends and an open Well in the bottom, and'a sheet metal pan registering with said open well having fiat flanges abutting against the lower face of said crank case.

6. A multi-cylinderengine of the V-type comprising complementary sections abutting in the central vertical plane of the engine, each section consisting of a crank case portion and a plurality of cylinders cast en bloc, a crank shaft and a cam shaft arranged in the meeting plane of said sections,-

valves for the cylinders, actuating valve rods extending from said cam shaftparallel to said cylinders Within the V-space, and covers for inclosing said valve rods.

7 A multi-cylinder engine of the V-type comprising complementary sections, each consisting of a plurality of cylinders and a portion of the crank case cast en bloc, said crank case sections meeting in the central vertical plane of the engine and being extended upward into the V-space between the opposite sections, a crank shaft and a cam shaft arranged in the meeting plane of said crank case sections and the latter shaft being located in the upwardly-extending portion, valve rods' extending from said cam shaft parallel to said engine cylinders and passing through the walls of said crank case sections into the V-space ther'eabove,

lateral extensions of said cylinders forming a pocket through which said rods pass, and

- covers for closing said pockets and protecting said rods.

8. A multi-cylinder engine of the V-type,

comprising complementary sections, each.

section'consisting of a' plurality of cylinders and a portion of the crank case cast en bloc, said crank case portions meeting in the cen tral vertical plane of the engine and extending laterally from the engine cylinders upward into the V-space therebetween to increase the vertical dimension of the crank case, and a cam shaft located in said upward extension.

9. A multi-cylinder engineof the V-type, comprising complementary sections, each consisting of a plurality of parallelly-arranged cylinders and a portion of the crank case cast en bloc, said sections meeting in the vertical central plane of the engine and the crank case portions extending upward into the V-space between the cylinders, a cam shaft located in the upward extension of said crank case, valve rods extending from said cam shaft parallel to said cylinders, detachable heads for said cylinders having valves mounted thereoinand levers also EARL G. GUNN.

Witnesses:

VVM. J. BELKNAP, JAMES P. BARRY. 

